ESP8266EX Beginner’s Guide
2.5. Low Power Operation
ESP8266EX supports 3 low power operation modes:
2.6. Firmware Updater
In addition to the usual serial flash update, ESP8266EX also supports firmware update
through Cloud server. Simply upload the new firmware to the Cloud server and when
ESP8266EX is connected to the internet, the Cloud server will push the update to the user.
The user can then choose to upgrade or not.
For serial flash update, refer to “Espressif IoT SDK Manual”.
For Cloud update, refer to “Espressif Cloud Introduction”
!
Turn off Wi-Fi modem
CPU and other peripherals
are still running.
Turn off Wi-Fi modem, crystal
and PLL
CPU and other peripherals
are suspended.
Only RTC circuit is working,
all others are off, chip is in
low power standby mode.
Wake up based on defined
interval settings only.
Used when CPU needs to
be running all the time,
e.g. PWM or I2S
applications.
If there is no data
transmission, Wi-Fi modem
can be turned off
according to the 802.11
standards (U-APSD).
E.g. During DTIM3, each
cycle is 300ms, wake 3ms
receive AP's Beacon
packages, etc., overall
average current of about
15mA.
Used in applications where
the CPU can be suspended,
e.g. Wi-Fi switch.
If there is no data
transmission, according to the
802.11 standard (such as U-
APSD), turn off Wi-Fi modem
and suspend CPU.
E.g DTIM3, each sleep
(300ms)—wake (3ms) receive
AP's Beacon packages, etc.,
the overall average current of
about 0.9mA. "
Used in applications where
Wi-Fi need not be always
connect, a long time before
transmitting the application
data packets.
Measured once every 100
seconds, such as the
temperature sensor.
E.g. after waking up every
300S need 0.3 ~ 1s connected
to the AP transmit data, the
overall average current can be
much less than 1mA.
! | Page" " September 17, 2014 28
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